1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.transition; 18 19 import android.animation.Animator; 20 import android.animation.ObjectAnimator; 21 import android.animation.TimeInterpolator; 22 import android.view.View; 23 import android.view.ViewGroup; 24 import android.view.animation.AccelerateInterpolator; 25 import android.view.animation.DecelerateInterpolator; 26 27 /** 28 * This transition captures the visibility of target objects before and 29 * after a scene change and animates any changes by sliding the target 30 * objects into or out of place. 31 * 32 * @hide 33 */ 34 public class Slide extends Visibility { 35 36 // TODO: Add parameter for sliding factor - it's hard-coded below 37 38 private static final TimeInterpolator sAccelerator = new AccelerateInterpolator(); 39 private static final TimeInterpolator sDecelerator = new DecelerateInterpolator(); 40 41 @Override 42 public Animator onAppear(ViewGroup sceneRoot, 43 TransitionValues startValues, int startVisibility, 44 TransitionValues endValues, int endVisibility) { 45 View endView = (endValues != null) ? endValues.view : null; 46 endView.setTranslationY(-2 * endView.getHeight()); 47 ObjectAnimator anim = ObjectAnimator.ofFloat(endView, View.TRANSLATION_Y, 48 -2 * endView.getHeight(), 0); 49 anim.setInterpolator(sDecelerator); 50 return anim; 51 } 52 53 @Override 54 public Animator onDisappear(ViewGroup sceneRoot, 55 TransitionValues startValues, int startVisibility, 56 TransitionValues endValues, int endVisibility) { 57 View startView = (startValues != null) ? startValues.view : null; 58 startView.setTranslationY(0); 59 ObjectAnimator anim = ObjectAnimator.ofFloat(startView, View.TRANSLATION_Y, 0, 60 -2 * startView.getHeight()); 61 anim.setInterpolator(sAccelerator); 62 return anim; 63 } 64 65 } 66
